BIOSORPTION OF COPPER(Ⅱ) ON IMMOBILISED Synechocystis aquatilis

摘要

Synechocystis aquatilis was immobilized in Ca-alginate via entrapment. The plain alginate, and alive and heat-inactivated immobilized algae beads were used for the sorption of Cu~(2+) ions from aqueous solutions at 25℃. Kinetic studies showed a fast initial rate, followed by a slower biosorption one. Adsorption of Cu~(2+) on the biosorbents increased with increasing initial Cu~(2+) ions level in the solution. The heat-inactivated alga preparation showed a higher biosorption capacity than the alive counterpart. The biosorption equilibrium was established approx. in 3 h, and the equilibrium was well-described by the Lang-muir and Freundlich adsorption isotherms. The effect of pH was also investigated and the maximum adsorption of Cu~(2+) ions on the biosorbents was obtained approx. at pH 5.6